I have a juvenile female sword who was in a tank with a mature female and male. They were all in a quarantine tank for about 3 days tank (10 gallon). I just put them with my general population of zebra danios, platies, neons and otos. I noticed the little one with a white spot kind of shredded on her dorsal fin. Today it is larger. I think she was nipped and it's now rotting. I have put in a couple of teaspoons of aquarium salt and some stress realiver in my 25 gallon tank. Should I remove her back into quarantine or leave her for a day or two?